Rotary pump



June 1 ,1926.

W. HOHAGEN ROTARY PUMPY Fild Nov 13,- 1924 Patented June 1 I 1926-.

UNITED STATES PA NT OFFICE.

WALTER HOHAGEN', or FALKENSEE, N AR srernmu, GERMANY, essrenon. To

SIEMENS-SCHUCKERTWERKE ,eEsELLscHA 'r mrr BESCHRANKTEB HAFTUN'G, or SIEMENSSTADT, EAE BERLIN, AND ELSEWHERE, GERMANY, A. CORPORATION 0E GERMANY.

ROTARY PUMP.

Application filed November 13, 1924, Serial No. 749,653, and in Germany November 26, 1923.

My invention relates to improvements in rotary pumps and more particularly in multiple rotary pumps and consists of a sealing device comprising an auxiliary liquid for preventing leakage losses owing tothe flow of the supply medium from one pump chamber into another.

It is well known that for delivering gases rotary pumps, impeller pumps, gear pumps, pumps with sliding vanes and the like are em loyed in which a' stora e chamber, genera ly located above the dlscharge opening of the pump, contains an auxillary liquid for sealing the pump, such as water, oil or mercury. For some purpose it is advantageous to combine two or more umps of this kind so that a multiple pump is formed,

the individual pumpsof which havea common drive but must otherwise be independent of one another.

Owing to the compact combination of the individual pumps particularly difficulties.

arise in regard tothe provision of a satisfactory seal between the individual working chambers. A flow of the medium to be delivered from one pumpmhamber into the other must be avoided as far'as possible by preventing that the auxiliary li uid in one of the sealing chamberssof one o the pumps is sucked off by the otherpump and there-' bya shortage ofauxiliary liquid arises in the former. Inthis manner a satisfactory balanceof the auxiliary liquid in the various chambers so that a shorta of sealing liquid in any individual cham er cannot occur under an circumstances.

In the drawmg atfixed to this "specification and forming part thereof two embodiments of my invention are illustrated by way of example. Thesedrawings represent 1n:-

Fig. 1, a longitudinal section through a duplex pump.-

Fig. 2, a transversesection through the same.

. Fig. 3, a longitudinal section through a andi 14 upon the common shaft 15. The partition wall between the two working chambers consists, for instances, of the two parts 16 and 17. Theintake branches are. indicated by the reference characters 18 and 19.

Above the piston barrel are disposed the storage chambers 20 and 21 which open into the delivery branches 22 and 23. The two storage chambers 20 and 21 are in communication by the bore 24 so that the aux1l1- ary liquid is free to flow. from one to the other in orderto balance iany shortage.

If the improvement is to be applied to rotary pumps with pistons adapted to slide in-the piston barrel the piston barrels for the individual pumps may according to my invention in known manner be carried out as single continuous cylindrical roller. In this construction the balancing connection between the storage chambers of the individual pumps is of particular importance because the distance between'their working chambers is comparatively very small and a sucking off of the auxiliary liquid from one pump into the other is particulariy liable to occur.

Such a construction is illustrated in the Figs. 3 and 4. -The piston barrels for the individual pumps are here combined into a cylindrical roller 25. The working chambers 11 and 12 are separated one from each other by a partition wall 26. Otherwise the construction and arrangement is thesame as in the Figs. 1 and 2. By providing the bore 24; putting the storage chambers 20 and 21in communication thesucking oil of the auxiliary liquid from one of the sealing chambers is agaln prevented.

What I claim as my invention is 1. A multiplle rotary pump havin adjacent pump 0 ambers and commonly riven piston rotors disposed thereon, an intake and a discharge port for each chamber and a storage chamber connected to each discharge port and containing sealing liquid, and means for connecting the several storage chambers to equalize the sealing liquid in said storage chambers.

2.. A multiple rotary pump having adjacent pump chambers and commonly driven piston rotors disposed thereon, an intake and -a discharge port for each chamber and a storage chamber connected to each discharge port and containing sealing liquid, the several storage chambers being connected by a communicating duct, to equalize port for each chamber and a storage cham-v ber connected to each discharge port and containing sealing 1iquid,- said storage chamber being connected by a communicating duct, to equalize the sealing liquid in said storage chambers.

In testimony whereof I affix my signature.

WALTER HOHAGEN. 

